While extremely rare, there have been documented cases of couples reaching their 90th wedding anniversary, often referred to as the "Stone Anniversary." In the history of recorded marriage, very few couples live long enough and marry young enough to reach this incredible milestone. One notable example is Karam and Kartari Chand, a British-Indian couple who were married for 90 years and 291 days before Karam passed away in 2016 at the age of 110. Another example is the American couple Herbert and Zelmyra Fisher, who were married for 86 years, setting a Guinness World Record before their passing. In 2026, as life expectancy increases, we may see more centenarians reaching the 80th (Oak) or 85th (Wine) anniversaries, but the 90th remains the "pinnacle" of marital longevity. Reaching this milestone requires both partners to live past 105 if they married at age 15, making it a biological and social anomaly. It is a testament to extraordinary health and commitment, celebrated worldwide as a near-impossible feat of human endurance and companionship.